After attending a seminar given by one of Oppenheimer’s pupils on Fermi’s beta-ray theory, Fermi met me and said: “Emilio, I am getting rusty and old. I cannot follow the highbrow theory developed by Oppenheimer’s pupils anymore. I went to their seminar and was depressed by my inability to understand them. Only the last sentence cheered me up; it was: ‘And this is Fermi’s theory of beta decay.’“
